You really struck a chord with me on 240. All these JavaScript replacements are just that.. replacements. They were relevant before ES6 but now, why use them? I recently had an opportunity to write a small JavaScript UI library and I did it with ES6. Pure, native ES6 code with classes. Yes, classes are actually useful too. I used to hate JavaScript with all my heart but ES6 is really good enough to just write workable useful code. I even used modules which are not even a standard yet but transpilers solve that problem for now. With modules and classes, you end up with a really nice and modular code, basically no different than your good old Java structure. It really makes me happy.

PS: Angular 2 forcing TypeScript gets my rage going in high quantities.